Variable-diameter electric wrench and robot with same

Abstract

The utility model provides a variable-diameter electric wrench and a robot with the same, the variable-diameter electric wrench comprises a mounting shell provided with a mounting cavity, an adjusting chuck coaxially arranged in the mounting cavity with the mounting shell, and at least two clamping jaws arranged at intervals along the circumferential direction of the mounting shell, the clamping jaws can be arranged on the mounting shell in a sliding mode in the radial direction of the mounting shell, and the mounting shell limits the clamping jaws in the circumferential direction; the bottoms of the clamping jaws extend into the mounting cavity and are meshed with the adjusting chuck, and the adjusting chuck can drive the clamping jaws to move in the radial direction of the adjusting chuck at the same time; the first driving mechanism is in driving connection with the adjusting chuck and is used for driving the adjusting chuck to rotate around the central axis; the second driving mechanism is in driving connection with the mounting shell and used for driving the mounting shell to rotate around the center axis so as to drive the clamping jaw to rotate. According to the variable-diameter electric wrench, the clamping jaws can be adjusted according to the shapes and the sizes of the threaded parts, and meanwhile the adjustable clamping jaws move in the radial direction of the adjusting chuck so as to adapt to the threaded parts of different sizes.

Description

Technical Field

[0001] The utility model relates to the technical field of electric wrenches, in particular to a variable diameter electric wrench and a robot with the same. Background Art

[0002] During high-speed rail installation and routine maintenance, threaded components such as screws and nuts often need to be tightened and removed. While these components are generally standardized, they do vary in size and shape. To accommodate these varying sizes and shapes, wrenches must be highly versatile.

[0003] A Chinese invention patent (application publication number: CN104289735A) discloses a three-jaw chuck for a self-centering CNC pipe intersecting cutting machine. The contact surface between the disc gear and the slider is provided with an Archimedean spiral groove, and the slider is also provided with a thread. Using a wrench to turn the small bevel gear, the three jaws move radially at the same time, achieving centering and clamping of workpieces of different shapes and sizes, such as circles, equilateral triangles or regular hexagons.

[0004] Although the above-mentioned prior art can adapt to workpieces of different sizes, the above-mentioned patent has the following defects: First, it can only clamp and fix the workpiece, but cannot drive the workpiece to rotate, that is, the three-jaw chuck cannot be used to rotate the threaded part to tighten or loosen the threaded part; Second, to adjust the clamping force of the workpiece, it is necessary to manually use a wrench to rotate the small bevel gear, which will undoubtedly reduce the adjustment efficiency. Utility Model Content

[0005] The utility model provides a variable diameter electric wrench and a robot with the same, which are used for electrically tightening or disassembling threaded parts with different shapes and sizes, so as to improve the adaptability and adjustment efficiency of the electric wrench.

[0006] The utility model provides a variable diameter electric wrench, which comprises:

[0007] A mounting shell is formed with a mounting cavity;

[0008] an adjusting chuck, coaxially arranged with the mounting shell in the mounting cavity;

[0009] At least two claws are arranged at intervals along the circumference of the mounting shell and are used to cooperate with clamping the threaded member; the claws are slidably disposed on the mounting shell along the radial direction of the mounting shell, and the mounting shell circumferentially limits the claws; the bottoms of the claws extend into the mounting cavity and engage with the adjustment chuck, and the adjustment chuck can rotate about its own central axis to drive the claws to move radially inward or outward along the adjustment chuck, thereby clamping or releasing the threaded member;

[0010] a first driving mechanism, drivingly connected to the adjusting chuck, for driving the adjusting chuck to rotate around its central axis;

[0011] The second driving mechanism is drivingly connected to the mounting shell and is used to drive the mounting shell to rotate around its central axis to drive the claw to rotate.

[0012] Specifically, the first driving mechanism includes:

[0013] A first motor, wherein an output shaft of the first motor is coaxially fixedly connected to the central axis of the adjusting chuck.

[0014] Furthermore, the first motor is electrically connected to a detection element, and the detection element is used to detect the rotation direction and rotation angle of the first motor and feed back to the controller.

[0015] Furthermore, the detection element is an encoder.

[0016] Optionally, a sliding groove extending in a radial direction is provided on the mounting shell, and a sliding block slidably engaged with the sliding groove is fixedly provided on the bottom of the clamping claw.

[0017] Preferably, a thread groove is provided on one end surface of the adjusting chuck facing the sliding block, and a thread is provided on the contact surface of the sliding block with the adjusting chuck, and the thread is engaged with the thread groove.

[0018] Optionally, the second driving mechanism includes:

[0019] The gear transmission assembly includes a driven wheel fixedly mounted coaxially with the mounting housing, and a driving wheel meshing with the driven wheel for transmission;

[0020] The second motor is drivingly connected to the driving wheel.

[0021] Furthermore, the driven wheel and the driving wheel are both spur gears, and the diameter of the driven wheel is larger than the diameter of the driving wheel.

[0022] Furthermore, the second driving mechanism includes:

[0023] A reducer, wherein the input shaft of the reducer is fixedly installed coaxially with the output shaft of the second motor, and the output shaft of the reducer is fixedly installed coaxially with the rotating shaft of the driving wheel.

[0024] Preferably, the variable diameter electric wrench further includes:

[0025] The box body is formed with a receiving cavity, and the driving wheel and the driven wheel are arranged in the receiving cavity.

[0026] The utility model also provides a robot, comprising the aforementioned variable diameter electric wrench, wherein the variable diameter electric wrench is installed at the execution end of the robot.

[0027] Compared with the prior art, the advantages of the present invention are:

[0028] 1. The operating principle of the variable diameter electric wrench in the embodiment of the utility model is basically as follows:

[0029] The position of the clamping jaws is adjusted according to the shape and size of the threaded part: the first driving mechanism drives the adjusting chuck to rotate forward or reverse, driving the clamping jaws to move radially inward or outward along the adjusting chuck at the same time to adapt to threaded parts of different sizes; then, the variable diameter electric wrench is aligned with the threaded part to make the threaded part extend into the clamping jaws, and the position of the clamping jaws is continued to be adjusted, and the threaded part is clamped by the clamping jaws; the second driving mechanism drives the mounting shell to rotate, and since the mounting shell limits the clamping jaws circumferentially, the mounting shell can drive the clamping jaws to rotate together, thereby screwing the clamped threaded part.

[0030] When screwed into place, the mounting shell stops rotating. At this time, the first driving mechanism drives the adjusting chuck to rotate in the opposite direction, so as to drive the claws to move radially outward along the adjusting chuck at the same time, thereby releasing the screwed mounting piece.

[0031] Similarly, the variable diameter electric wrench can be used to disassemble threaded parts of different shapes and sizes, and the disassembly process will not be described in detail. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention will be described in more detail below based on embodiments with reference to the accompanying drawings.

[0033] Figure 1 This is an isometric view of a variable diameter electric wrench according to an embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of the internal structure of the variable diameter electric wrench in the embodiment of the utility model;

[0035] Figure 3 This is a schematic diagram of the connection between the driven wheel and other components;

[0036] Figure 4 This is a schematic diagram of a variable diameter electric wrench installed on a robot during operation.

[0037] Reference numerals:

[0038] 1. Mounting shell; 11. Slideway; 101. Bottom shell; 102. Top cover;

[0039] 2. Adjusting chuck; 21. Thread groove;

[0040] 3. Claw; 31. Slider;

[0041] 4. First driving mechanism; 41. First motor; 42. Motor base;

[0042] 5. Second driving mechanism; 51. Driving wheel; 52. Driven wheel; 53. Second motor; 54. Reducer;

[0043] 6. Box body; 61. First cover body; 62. Second cover body;

[0044] 7. Rotary joint;

[0045] 8. Bearing retaining ring; 9. Thrust bearing;

[0046] 100. Variable diameter electric wrench; 200. Robot. DETAILED DESCRIPTION

[0047] The present invention will be further described below with reference to the accompanying drawings.

[0048] An embodiment of the present utility model provides a variable diameter electric wrench 100 , which includes a mounting shell 1 , an adjusting chuck 2 , a clamping jaw 3 , a first driving mechanism 4 and a second driving mechanism 5 .

[0049] The mounting shell 1 is formed with a mounting cavity, and the adjusting chuck 2 is located in the mounting cavity and is coaxially arranged with the mounting shell 1 .

[0050] At least two claws 3 are arranged at intervals along the circumference of the mounting shell 1 and are used to cooperate in clamping the threaded parts; the claws 3 can be set on the mounting shell 1 so as to slide radially along the mounting shell 1, and the mounting shell 1 limits the claws 3 circumferentially; the bottom of the claws 3 extends into the mounting cavity and engages with the adjusting chuck 2.

[0051] The first driving mechanism 4 is connected to the adjusting chuck 2 and is used to drive the adjusting chuck 2 to rotate around its central axis; the adjusting chuck 2 can rotate around its own central axis to drive the claws 3 to move radially inward or outward along the adjusting chuck 2 at the same time, thereby clamping or releasing the threaded part.

[0052] The second driving mechanism 5 is drivingly connected to the mounting shell 1 and is used to drive the mounting shell 1 to rotate around its central axis, thereby driving the claw 3 to rotate.

[0053] The operating principle of the variable diameter electric wrench 100 in the embodiment of the present utility model is basically as follows:

[0054] The position of the jaws 3 is adjusted according to the shape and size of the threaded part: the first driving mechanism 4 drives the adjusting chuck 2 to rotate forward or reverse, driving the jaws 3 to move radially inward or outward along the adjusting chuck 2 at the same time to adapt to threaded parts of different sizes; then, the variable diameter electric wrench 100 is aligned with the threaded part so that the threaded part extends between at least two jaws 3, and the position of the jaws 3 is continued to be adjusted, and the threaded part is clamped by the jaws 3; the second driving mechanism 5 drives the mounting shell 1 to rotate. Since the mounting shell 1 limits the jaws 3 circumferentially, the mounting shell 1 can drive the jaws 3 to rotate together, thereby screwing the clamped threaded part.

[0055] When screwed into place, the mounting shell 1 stops rotating. At this time, the first driving mechanism 4 drives the adjusting chuck 2 to rotate in the opposite direction, thereby driving the claws 3 to move radially outward along the adjusting chuck 2 at the same time, thereby releasing the screwed mounting piece.

[0056] Similarly, the variable diameter electric wrench 100 can be used to disassemble threaded parts of different shapes and sizes, and the disassembly process will not be described in detail.

[0057] The first drive mechanism 4 in this embodiment of the utility model includes a first motor 41, the output shaft of which is coaxially fixedly connected to the central axis of the adjustment chuck 2. The first motor 41 is used to drive the adjustment chuck 2 to rotate, which in turn drives the claw 3 engaged with the adjustment chuck 2 to move radially along the adjustment chuck 2.

[0058] When the first motor 41 stops, the adjusting chuck 2 is acted upon by the output shaft of the first motor 41 so that the claw 3 cannot move circumferentially relative to the adjusting chuck 2 , thereby keeping the claw 3 in a relative radial position on the mounting shell 1 and self-locking the claw 3 .

[0059] The first motor 41 is electrically connected to a detection element, which is used to detect the rotation direction, rotation angle and number of rotations of the first motor 41 and feed back to the controller.

[0060] Since the first motor 41 rotates coaxially and synchronously with the adjusting chuck 2, the rotation direction and rotation angle of the first motor 41 detected by the detection element also represent the rotation direction and rotation angle of the adjusting chuck 2, so that the corresponding radial displacement of the claw 3 can be obtained, and then the controller controls the start and stop of the first motor 41, so that the clamping force of the claw 3 on the threaded part is controlled within a preset range.

[0061] Preferably, the detection element is an encoder.

[0062] A sliding groove 11 extending in the radial direction is provided on the mounting shell 1 , and a sliding block 31 slidably engaged with the sliding groove 11 is fixedly provided on the bottom of the claw 3 .

[0063] A thread groove 21 is provided on one end surface of the adjusting chuck 2 facing the slider 31 , and a thread is provided on the contact surface of the slider 31 with the adjusting chuck 2 , which meshes with the thread groove 21 .

[0064] The second driving mechanism 5 includes a gear transmission assembly and a second motor 53 .

[0065] The gear transmission assembly includes a driven wheel 52 fixedly mounted coaxially with the mounting housing 1 , and a driving wheel 51 meshing with the driven wheel 52 ; a second motor 53 is drivingly connected to the driving wheel 51 .

[0066] The driven wheel 52 and the driving wheel 51 are both spur gears, and the diameter of the driven wheel 52 is larger than that of the driving wheel 51 .

[0067] The second driving mechanism 5 includes a reducer 54 disposed between the second motor 53 and the driving wheel 51. The input shaft of the reducer 54 is fixedly mounted coaxially with the output shaft of the second motor 53, and the output shaft of the reducer 54 is fixedly mounted coaxially with the rotating shaft of the driving wheel 51. The reducer 54 may be a harmonic reducer 54.

[0068] The output shaft of the second motor 53 is decelerated by the reducer 54, and drives the driving wheel 51 to rotate, and drives the driven wheel 52 engaged with the driving wheel 51 to rotate, and the driven wheel 52 drives the mounting shell 1 to rotate, and the mounting shell 1 drives the claw 3 to rotate, thereby screwing the threaded part.

[0069] The first motor 41 is fixedly mounted on the wheel disc of the driven wheel 52 via the motor base 42 .

[0070] It should be noted that, during the process of screwing the threaded member, the driven wheel 52 drives the second motor 53 fixed thereon to rotate together. At this time, the adjusting chuck 2 rotates coaxially and synchronously with the mounting shell 1 in the mounting cavity.

[0071] The variable diameter electric wrench 100 further includes a box body 6 , which is formed with an accommodating cavity, and the driving wheel 51 and the driven wheel 52 are arranged in the accommodating cavity.

[0072] The second motor 53 is located outside the accommodating cavity. The output shaft of the second motor 53 passes through the box body 6 and extends into the accommodating cavity and is fixedly mounted to the reducer 54 provided in the accommodating cavity.

[0073] The first motor 41 is disposed in the accommodating cavity and is fixedly mounted on the driven wheel 52 via a mounting seat.

[0074] The first motor 41 is connected to the external power source via a power cord. Specifically, the end of the power cord connected to the first motor 41 is connected to a rotary connector 7. A mounting hole is provided on a side wall of the housing 6 facing the first motor 41. The rotary connector 7 is mounted within this mounting hole. One end of the power cord is connected to the rotary connector 7, and the other end is connected to the external power source.

[0075] By providing the rotary joint 7 , the first motor 41 can ensure that the power cord does not rotate during the rotation of the follower driven wheel 52 , thereby preventing the power cord from being entangled or knotted.

[0076] The box body 6 includes a first cover body 61 and a second cover body 62 which are installed and connected in a split manner. The accommodating cavity is defined by the first cover body 61 and the second cover body 62 .

[0077] A bearing retaining ring 8 and a thrust bearing 9 are installed on the rotating shaft of the driven wheel 52. The bearing retaining ring 8 and the thrust bearing 9 are installed and limited between one end surface of the driven wheel 52 and the mounting shell 1. The thrust bearing 9 is used to axially support the mounting shell 1.

[0078] The mounting housing 1 comprises a fixed bottom housing 101 and a top cover 102, wherein a mounting cavity is enclosed by the bottom housing 101 and the top cover 102. The claws 3 are radially slidably mounted on the top cover 102.

[0079] An embodiment of the present utility model provides a robot, in which a variable-diameter electric wrench 100 is installed on the execution end of the robot 200. The robot 200 adjusts the posture of the variable-diameter electric wrench 100 according to the position of the threaded part, thereby disassembling and installing threaded parts of different shapes or sizes at high-risk positions in railway maintenance, and has a wide range of application scenarios and applicability.

[0080] While the present invention has been described with reference to preferred embodiments, various modifications may be made and equivalent components may be substituted without departing from the scope of the present invention. In particular, the various technical features described in the various embodiments may be combined in any manner, provided no structural conflicts exist. The present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A variable diameter electric wrench, characterized in that: The invention comprises a mounting shell having a mounting cavity, an adjusting chuck coaxially disposed within the mounting cavity, and at least two claws, the at least two claws being arranged at intervals along the circumference of the mounting shell and being used to cooperate with a clamping screw member, the claws being slidably disposed on the mounting shell along the radial direction of the mounting shell, and the mounting shell circumferentially limiting the claws; The bottom of the clamping claw extends into the mounting cavity and engages with the adjusting chuck. The adjusting chuck can rotate around its own central axis to drive the clamping claw to move radially inward or outward along the adjusting chuck at the same time, thereby clamping or releasing the threaded member. Also includes: a first driving mechanism, drivingly connected to the adjusting chuck, for driving the adjusting chuck to rotate around its central axis; The second driving mechanism is drivingly connected to the mounting shell and is used to drive the mounting shell to rotate around its central axis to drive the claw to rotate.

2. The variable diameter electric wrench according to claim 1, characterized in that: The first driving mechanism comprises: A first motor, wherein an output shaft of the first motor is coaxially fixedly connected to the central axis of the adjusting chuck.

3. The variable diameter electric wrench according to claim 2, characterized in that: The first motor is electrically connected to a detection element, and the detection element is used to detect the rotation direction and rotation angle of the first motor and feed back the information to the controller.

4. The variable diameter electric wrench according to claim 3, characterized in that: The detection element is an encoder.

5. The variable diameter electric wrench according to any one of claims 1 to 4, characterized in that: The mounting shell is provided with a sliding groove extending in a radial direction, and the bottom of the clamping claw is fixedly provided with a sliding block that is slidably matched with the sliding groove.

6. The variable diameter electric wrench according to claim 5, characterized in that: A thread groove is provided on one end surface of the adjusting chuck facing the sliding block, and a thread is provided on the contact surface of the sliding block with the adjusting chuck, and the thread is engaged with the thread groove.

7. The variable diameter electric wrench according to any one of claims 1 to 4, characterized in that: The second driving mechanism comprises: The gear transmission assembly includes a driven wheel fixedly mounted coaxially with the mounting housing, and a driving wheel meshing with the driven wheel for transmission; The second motor is drivingly connected to the driving wheel.

8. The variable diameter electric wrench according to claim 7, characterized in that: The driven wheel and the driving wheel are both spur gears, and the diameter of the driven wheel is larger than the diameter of the driving wheel.

9. The variable diameter electric wrench according to claim 8, characterized in that: The second driving mechanism comprises: A reducer, wherein the input shaft of the reducer is fixedly installed coaxially with the output shaft of the second motor, and the output shaft of the reducer is fixedly installed coaxially with the rotating shaft of the driving wheel.

10. The variable diameter electric wrench according to claim 9, characterized in that: Also includes: The box body is formed with a receiving cavity, and the driving wheel and the driven wheel are arranged in the receiving cavity.

11. A robot, characterized in that: The invention comprises the variable diameter electric wrench according to any one of claims 1 to 10, wherein the variable diameter electric wrench is installed at the execution end of the robot.

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